43721216 has 80 divisors (see below), whose sum is σ = 109010880. Its totient is φ = 17018880.

The previous prime is 43721189. The next prime is 43721257. The reversal of 43721216 is 61212734.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38870 + ... + 39978.

It is an arithmetic number, because the mean of its divisors is an integer number (1362636).

Almost surely, 2^43721216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54505440).

43721216 is an abundant number, since it is smaller than the sum of its proper divisors (65289664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43721216 is a wasteful number, since it uses less digits than its factorization.

43721216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1129 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 43721216 is about 6612.2020537791. The cubic root of 43721216 is about 352.2876436702.

The spelling of 43721216 in words is "forty-three million, seven hundred twenty-one thousand, two hundred sixteen".